The |semitendinosus| muscle originates from the |ischium| (hip). Its long, narrow, fleshy belly ends two-thirds of the way down the thigh at its ~tendon~. It sits in the muscular groove formed in the |semimembranosus| muscle at the inner back of the thigh. This muscle flexes (bends) the lower leg and extends (straightens) the thigh at the hip joint. It is considered one of the hamstring muscles. Its ~tendon~, along with the ~tendons~ of the |semimembranosus| and the |gracilis| muscles, forms the inner hamstring.
